body,.pc{
  margin: 0;
  overflow: hidden;
  height: 100vh;
}

a:focus {
  outline: none;
}

.clearfix::before,
.clearfix::after {
  content: "";
  clear: both;
  display: block;
}

.canvas {
  width: 100%;
  height: 100%;
  position: relative;
  .gui {
    position: absolute;
    right: 0;
    top: 0;
  }
}

